[kbenson]

I think attackers would just try to make the system offer to disable security whenever possible then. Anything as easy as clicking an already offered option by the OS itself will be used often enough to negate most of the security benefits of that mode IMO, meaning you deal with it being slower be default and probably not as secure as you think because people will opt out often for convenience, so the worst of both worlds.

As I understand it this was a real problem with earlier versions of Windows where it kept asking for admin privileges all the time for simple things, and people got conditioned to just authorize it. They made a concerted effort to provide APIs that didn't require it for most actions to combat this.